//*book.c -- 一本书的图书目录

#include <stdio.h>
#include <string.h>

char * s_gets(char * st, int n);

#define MAXTITL 41      /* 书名的最大长度 + 1      */
#define MAXAUTL 31      /* 作者姓名的最大长度 + 1   */

struct book {           /* 结构模板：标记是 book    */
    char title[MAXTITL];
    char author[MAXAUTL];
    float value;
};                       /* 结构模板结束 */

int main(void)
{
    struct book library;    /* 把 library 声明为一个 book 类型的变量 */

    printf("Please enter the book title.\n");
    s_gets(library.title, MAXTITL);     /* 访问 title 部分 */
    printf("Now enter the author.\n");
    s_gets(library.author, MAXAUTL);
    printf("Now enter value.\n");
    scanf("%f", &library.value);
    printf("%s by %s: $%.2f\n", library.title,
        library.author, library.value);
    printf("%s: \"%s\" ($%.2f)\n", library.author, 
        library.title, library.value);
    printf("Done.\n");

    return 0;
}

char * s_gets(char * st, int n)
{
    char * ret_val;
    char * find;

    ret_val = fgets(st, n, stdin);
    if (ret_val)
    {
        find = strchr(st, '\n');    // 查找换行符
        if (find)                   // 如果地址不是 NULL，
            * find = '\0';          // 在此处放置一个空字符
        else
            while (getchar() != '\n')
                continue;           // 处理输入行中剩余的字符
    }
    return ret_val; 
}
// Chicken of the Andes
// Disma Lapoult
// 29.99